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I don't get what the 'insert line divider' is meant to be. It seems to just insert a large, fixed amount of whitespace characters?

Try it out! It's a hyphen-based separator I found myself using to divide chunks of text. For now it almost functions as "sub-notes" feature.

The keyboard shortcut is Cmd/Ctrl + /

Yes, I did try it out-- for me at least, on FF/Win7, it just inserts about 20 whitespace characters.